Wet-type wheel edge braking structure

Abstract

The wet-type wheel side braking structure comprises an axle package assembly, and a left half shaft and a right half shaft which extend leftwards and rightwards are arranged in the axle package assembly; rim assemblies are arranged at the tail ends of the left half shaft and the right half shaft, wheel edge assemblies are fixed to the tail ends of the rim assemblies, braking assemblies are arranged in the rim assemblies, and the braking assemblies are matched with the left half shaft / the right half shaft and the wheel edge assemblies to achieve vehicle braking; the brake assembly at least internally comprises a stepped piston assembly, and the piston assembly enables brake pressure to be rapidly established and reduces the overcharge phenomenon. The brake safety performance is greatly improved, and meanwhile compared with the design that an existing brake is designed in the middle of an axle package, and the whole brake must be detached during maintenance or seal replacement, the brake is more convenient and easy to maintain.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle braking, and in particular to a wet wheel brake structure. Background Art

[0002] Loaders are widely used construction machinery vehicles, used in stone factories, coal factories, steel factories and many other working conditions to transfer goods quickly and efficiently. At present, loaders mainly use a transmission system design of twin-turbine planetary gearbox plus dry brake bridge, which has a high cost performance.

[0003] However, with the development of society, higher requirements are put forward for the safety and comfort of vehicles. More and more wet brake bridges are being used, which greatly prolongs the brake life and improves the braking safety while meeting the performance requirements. Most of the existing wet brake bridges have the brake designed in the middle of the bridge package, and the braking torque needs to be transmitted from the half shaft to the wheel side planetary brake structure. If the brake fails or needs to be repaired, the entire bridge must be removed when replacing the seal, which increases the difficulty of maintenance. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a wet wheel brake structure.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a wet wheel brake structure, comprising a bridge pack assembly, wherein a left half shaft and a right half shaft extending to the left and right are arranged inside the bridge pack assembly;

[0006] The ends of the left and right half shafts are both provided with a rim assembly, at the ends of which a wheel edge assembly is fixed, and inside the rim assembly is provided a brake assembly, which cooperates with the left / right half shaft and the wheel edge assembly to achieve vehicle braking;

[0007] The brake assembly includes at least a stepped piston assembly, which enables the brake pressure to be quickly built up and reduces overcharging.

[0008] As a further description of the above technical solution, the bridge pack assembly includes a reducer assembly, and the reducer assembly includes a rotating shaft connected to an external engine and a hyperbolic spiral bevel gear set.

[0009] As a further description of the above technical solution, the brake assembly includes a wheel side support shaft assembly, the wheel side support shaft assembly extends into the interior of the wheel hub, and cooperates with the inner wall of the wheel hub through a tapered roller bearing and a spacer sleeve, a wheel side end cover is fixed to the other end of the wheel hub facing away from the wheel side support shaft assembly, a sun gear is arranged at the inner center of the wheel side end cover, and a planetary gear is arranged around the outside of the sun gear;

[0010] The end of the sun gear extending toward the wheel side support shaft assembly is connected with an outer gear ring assembly, and the outside of the star gear is connected with an inner gear ring.

[0011] As a further description of the above technical solution, the piston assembly is arranged in the space between the outer gear ring assembly, the wheel hub assembly and the wheel side support shaft assembly, a piston pressure plate is arranged on one side of the piston assembly, and a plurality of steel sheets, paper-based friction sheets and stop pads are arranged between the piston pressure plate and the piston assembly.

[0012] As a further description of the above technical solution, a brake oil cylinder is provided on one side of the piston assembly, the brake oil cylinder is connected to the wheel side support shaft assembly through a flow channel, and multiple flow channel openings of the wheel side support shaft assembly are all equipped with brake oil plugs;

[0013] An internally rotating combined skeleton oil seal is provided between the wheel side support shaft assembly and the wheel hub assembly.

[0014] As a further description of the above technical solution, the piston assembly is connected to the wheel hub assembly via a reset tension spring and a tension spring fixing ring, so that the piston assembly can be reset after losing the push of brake oil.

[0015] As a further description of the above technical solution, the total diameter of the piston assembly is 232.2 mm, and the cross-sectional diameter of the piston assembly is 220.7 mm.

[0016] As a further description of the above technical solution, the wheel side support shaft assembly includes a support shaft, the support shaft is made of 40Cr material, the forging is normalized, the whole is tempered, and then surface quenched.

[0017] As a further description of the above technical solution, the wheel side support shaft assembly also includes a dust cover, and the dust cover is arranged at the gap between the support shaft and the wheel hub assembly.

[0018] As a further description of the above technical solution, the dust cover is made of steel.

[0019] The present invention has the following beneficial effects:

[0020] 1. The present invention greatly improves the braking safety performance while meeting the load-bearing and driving functions of the axle. Compared with the existing brake design in the middle of the bridge package, which must be completely removed when repairing or replacing the seal, the present invention is more convenient and easy to maintain. In actual use, it can reduce a lot of cost investment and unnecessary work.

[0021] 2. The present invention adopts a stepped piston structure through the piston assembly of the present application. Compared with the existing non-step design, that is, the flat design, the braking pressure can be quickly established without causing overcharging due to a large amount of oil intake at one time caused by the large area of ​​the flat surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a wet wheel brake structure provided by the present invention;

[0023] Figure 2 A schematic diagram of the wheel brake structure proposed by the present invention;

[0024] Figure 3 A schematic diagram of the piston assembly proposed by the present invention.

[0025] Legend:

[0026] 1. Bridge package assembly; 2. Left half shaft; 3. Right half shaft; 4. Rim assembly; 5. Wheel side assembly; 6. Brake assembly; 601. Wheel side support shaft assembly; 6011. Support shaft; 6012. Dust cover; 602. Hub assembly; 603. Tapered roller bearing; 604. Spacer; 605. Wheel side end cover; 606. Sun gear; 607. Planetary gear; 608. Outer gear ring assembly; 609. Inner gear ring; 610. Piston pressure plate; 611. Steel sheet; 612. Paper-based friction plate; 613. Stop pad; 614. Brake cylinder; 7. Piston assembly; 8. Reducer assembly; 801. Hyperboloid spiral bevel gear set; 9. Brake oil blockage; 10. Inner rotating combined skeleton oil seal; 11. Reset tension spring; 12. Tension spring fixing ring. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Reference Figure 1-3, an embodiment provided by the present invention includes a bridge assembly 1, a left half shaft 2 and a right half shaft 3 extending to the left and right are connected inside the bridge assembly 1, and the left half shaft 2 and the right half shaft 3 are connected to the rim assembly 4 and the wheel side assembly 5 respectively, that is, the wheel can be driven to rotate through the left half shaft 2 and the right half shaft 3. A first-stage reduction is arranged inside the bridge assembly 1, that is, a differential assembly, which is combined with a limited slip differential through a hyperbolic spiral bevel gear set 801. A brake assembly 6 is arranged in the space between the rim assembly 4 and the wheel side assembly 5, specifically, a wheel side planetary reduction structure combined with a wet brake design, which greatly improves the braking safety performance while meeting the axle load and driving functions. At the same time, compared with the existing brake design in the middle of the bridge, the design that the entire brake must be removed when repairing or replacing the seal is more convenient and easy to maintain. In the actual use process, it can reduce a lot of cost investment and reduce unnecessary work.

[0029] Please continue to refer to Figure 2 The brake assembly 6 includes a wheel side support shaft assembly 601, which extends into the interior of the wheel hub assembly 602 and cooperates with the inner wall of the wheel hub assembly 602 through a tapered roller bearing 603 and a spacer sleeve 604 to achieve rotation. A wheel side end cover 605 is fixed to the other end of the wheel hub assembly 602 that is away from the wheel side support shaft assembly 601. A sun gear 606 is connected to the inner side of the wheel side end cover 605. A planetary gear 607 is arranged around the outside of the sun gear 606. The end of the sun gear 606 extending toward the wheel side support shaft assembly 601 is connected to an outer gear ring assembly 608. The outside of the planetary gear is connected to an inner gear ring 609. When the brake assembly 6 is not working, power is transmitted to the planetary gear 607 through the sun gear 606. The inner gear ring 609 is fixed to drive the wheel side end cover 605 to rotate, and then transmitted to the tire through the wheel hub assembly 602 to drive the vehicle forward.

[0030] Furthermore, a piston assembly 7 is arranged in the space between the outer gear ring assembly 608, the wheel hub assembly 602 and the wheel side support shaft assembly 601, and a piston pressure plate 610 is arranged on one side of the piston assembly 7. A plurality of steel sheets 611, a paper-based friction plate 612 and a stop pad 613 are arranged between the piston pressure plate 610 and the piston assembly 7, and a brake cylinder 614 is arranged on the other side of the piston assembly 7. The brake cylinder 614 is connected to the edge of the wheel side support shaft assembly 601 through a flow channel. Oil is supplied through the brake cylinder 614 to move the piston assembly 7, and then the paper-based friction plate 612 is engaged, thereby braking the outer gear ring, i.e., the rotating shaft, so that the sun gear 606 has no power input, thereby achieving a braking effect. Compared with the prior art, the structural design of the brake planetary carrier in the present application can reduce the braking torque. At the same time, the piston assembly 7 of the present application adopts a stepped piston structure, and the preferred total diameter of the piston end face is 232.2 mm and the cross-sectional diameter is 220.7 mm. Compared with the existing non-step design, that is, the flat design, the braking pressure can be quickly established without causing overcharging due to the large one-time oil intake caused by the large area of ​​the flat surface. Overcharging may cause abnormal pressure inside the braking system, affect the braking effect, and even cause system damage. The present application can minimize the occurrence of this problem.

[0031] Furthermore, the wheel side support shaft assembly 601 and the wheel hub bearing are connected by an inner rotating combined skeleton oil seal 10, which is mainly composed of a rubber seal body, an outer skeleton and an inner skeleton. The design feature of this oil seal is that the inner skeleton and the rotating shaft are fitted with an interference fit to ensure a good sealing effect during the rotation process.

[0032] Furthermore, the piston assembly 7 is connected to the wheel hub assembly 602 via a reset spring 11 and a spring fixing ring. After the piston assembly 7 loses the push of the brake oil, it can be quickly reset to avoid the reset delay of the piston assembly 7 affecting the normal vehicle movement.

[0033] Furthermore, the wheel side support shaft assembly 601 is described in detail, which includes a support shaft 6011 and a dust cover 6012, wherein the support shaft 6011 is made of 40Cr material, the forging is normalized, the whole is tempered, and then the surface is quenched, and it has strong mechanical properties and meets the design requirements of the drive axle support shaft 6011, and the dust cover 6012 is made of 08 steel, which has low strength but good toughness and plasticity, is easy to stamp into shape, and has low cost, which meets the use while improving the cost performance.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wet wheel brake structure, characterized in that: It includes a bridge pack assembly, wherein a left half shaft and a right half shaft extending to the left and right are arranged inside the bridge pack assembly; The ends of the left and right half shafts are both provided with a rim assembly, at the ends of which a wheel edge assembly is fixed, and inside the rim assembly is provided a brake assembly, which cooperates with the left / right half shaft and the wheel edge assembly to achieve vehicle braking; The brake assembly includes at least a stepped piston assembly, which enables the brake pressure to be quickly built up and reduces overcharging.

2. A wet wheel brake structure according to claim 1, characterized in that: The bridge pack assembly includes a reducer assembly, and the reducer assembly includes a rotating shaft connected to an external engine and a hyperbolic spiral bevel gear set.

3. A wet wheel brake structure according to claim 1, characterized in that: The brake assembly includes a wheel side support shaft assembly, the wheel side support shaft assembly extends into the interior of the wheel hub assembly, and cooperates with the inner wall of the wheel hub assembly through a tapered roller bearing and a spacer sleeve, a wheel side end cover is fixed to the other end of the wheel hub assembly facing away from the wheel side support shaft assembly, a sun gear is arranged at the inner center of the wheel side end cover, and a planetary gear is arranged around the sun gear; The end of the sun gear extending toward the wheel side support shaft assembly is connected with an outer gear ring assembly, and the outside of the star gear is connected with an inner gear ring.

4. A wet wheel brake structure according to claim 3, characterized in that: The piston assembly is arranged in the space between the outer gear ring assembly, the wheel hub assembly and the wheel side support shaft assembly, a piston pressure plate is arranged on one side of the piston assembly, and a plurality of steel sheets, paper-based friction sheets and stop pads are arranged between the piston pressure plate and the piston assembly.

5. A wet wheel brake structure according to claim 4, characterized in that: A brake oil cylinder is provided on one side of the piston assembly, and the brake oil cylinder is connected to the wheel side support shaft assembly through a flow channel, and multiple flow channel openings of the wheel side support shaft assembly are all equipped with brake oil plugs; An internally rotating combined skeleton oil seal is provided between the wheel side support shaft assembly and the wheel hub assembly.

6. A wet wheel brake structure according to claim 5, characterized in that: The piston assembly is connected to the wheel hub assembly via a reset tension spring and a tension spring fixing ring, so that the piston assembly can be reset after losing the push of the brake oil.

7. A wet wheel brake structure according to claim 1, characterized in that: The total diameter of the piston assembly is 232.2 mm, and the cross-sectional diameter of the piston assembly is 220.7 mm.

8. A wet wheel brake structure according to claim 5, characterized in that: The wheel side support shaft assembly comprises a support shaft, the support shaft is made of 40Cr material, the forging is normalized, the whole is tempered, and then the surface is quenched.

9. A wet wheel brake structure according to claim 8, characterized in that: The wheel side support shaft assembly also includes a dust cover, which is arranged at the gap between the support shaft and the wheel hub assembly.

10. A wet wheel brake structure according to claim 9, characterized in that: The dust cover is made of steel.

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